Frederick hoffman



2 Sh eets-Sheet l.

P. HOFFMAN. GOIN OPBRATBD TELEPHONE.

Patented Sept. 7,1897.

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(No Model.)

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.(No Modem i A F. HOFFMAN. GOIN OPERATED TELEPHGNE. No. 589,725. Patented sept. 7,1897.

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UNITEDb STATES PATENT Fries.

FREDERICK llOFFllIAN, OF PARAGOULD, ARKANSAS, ASSIGNOR TO ROSA I'IOFITMAN, OF SAME PLACE.

oom-OPERATED TELEPHONE.,

SPECIFICATION forming part of Letters Patent No. 589,726, dated September 7, 1897. Appnmnon nea May e, 1897. serrano. 634,930, fr@ maar 1o phones; and it consists of the novel construction, combination, and arrangement of parts hereinafter shown, described, and claimed.

Figure 1 is a front elevation of the tele phone-box, the lower part of the box being r shown in section to illustrate the mechanism and the parts of the mechanism being in position with the receiver off the hook and the circuit closed for talking. Fig. 2 is a vertical sectional view of the teleplione-box,tal;en on zo the same plane withsthe view shown in Fig. 1

and showing the receiver on the hook and the telephone-circuit broken. Fig. 3 is a erosssection taken approximately on the line 8 3 of Fig. 1. Fig. a is a view in perspective of z5 a lever which engages the receiver-hook of the Fig. 5 is a view in perspective of Fig. 6 is telephone. a segmental gear which I employ.

a view in perspective of the weighted lever. I

Fig. 7 isa view in perspective of the'spring- 3o arm and spur-pinion.

Referring by numerals to the drawings, 10 is the back Wall ofthe telephone-box; 1l and 12, the side walls; 13, the top, and 1l the bottom. is the telephone-rcceiver, and 1G the re- 3 5 ceiverdioolr. About one-third of the distance from the top'13 to the bottom 1l is an upper floor 17 and about one-fifth of the distance from the bottom 14; to the top 13 is a lower i'loor 18, having an opening 1i). An opening 4o 20 is formed through the side wall 11, immediately below the upper floor 17, and the U- shaped strip of sheet metal 21 connects the opening with the opening 19. The strip of sheet metal 22 connects the upper iioor17 45 with the side Wall 12, and said strip 22 is bent into the form of a U in cross-section and curved into the form of a segment longitudinally, and is mounted in alinement with the strip 2l., thus producing the coin-chute, as

5o shown in cross-section in Fig. 3.

An arm projects downwardly from the inner end of the receiver-hook 1G, thus making a bell-crank lever, and a retraetile coilspring 24a connects the lower end of the arm 23 with the inner face of the Wall 12, the tension of said spring being exerted to elevate the outer end of the receiver-hook, as shown in Fig. 1. 'lhelever (24 shown in perspective in Fig. a) is pivotally mounted by means of the pin 25,inserted through the opening 26 in said leverand fixed in the front and back Walls of the box. The end 2T of the lever 2i is bent laterally into a horizontal position and engages under the lever' of the receiver-hook 1G at a point imn'iediately inside of the Wall l2. A segmental gear 28 (shown in perspective in Fig. 5) is pivotally mounted by means of the pin 2J,inserted through the openings 30 in said segmental gear and iixed in the front and back Walls of the box.

The arm 31 projects from the opening 30 in the opposite direction from the teeth of the gear 28, and the free end 32 of said arm is bentlaterally and engages the upper side of the lower end of the lever The hook 33 is inserted through the opening Si, formed in the arm 31, and the Weight 35 is attached to and depends from said hook.

A spungear 3G is rotatably mounted upon the shaft 37 ,said shaft being fixed in the front and back Walls of the box, and the collar 3S projects forwardly from the hub of the gear 36. The arms 23S) and 40 project radially from said collar, the outer ends of said arms being connected bythe segment il. The springarm e2 is attached to the outer end of the arm 25S), immediately inside the segment 11, said arm 42 being inclined forwardly relative to the segment al.

The bar 13 is pivotally mounted upon the shaft 37, the upper end -itl of said bar being bent forwardly into a horizontal plane and a weight 45 being attached tothe lower end of said bar, thus producing a Weighted lever.

The coin-lever 46 extends through the opening i7 in the sheet-metal strip 22, and said lever is pivotally mounted upon the pin .48, said pin being inserted through said lever at a point immediately outside of the coin-chute and iixed in the front and bac-l; Walls of the box. The short end of the lever i6 operates Within the coin-chute in position to be e11- IOO lever.

gaged by the coin 49., (shown in dotted lines in Fig. 3 and infulllines in Fig. 1,) and the long end of said lever 4G is in position to engage the end 44 of the weighted lever when said coin-lever is operated by the coin to swing upwardly and said weighted lever is in its normal vertical position.

Assuming that the parts arc in the position shown in Ii'ig. 2, when the receiver' 15 is removed from the hook 16 the force of the weight will overbalance the segmental gear 2S, causing said gear to swing upwardly,thus rotating the Spur-gear 36 and carrying the spring-arm 42 downwardly to the position shown in Fig. 1, engaging the rear edge of the weighted lever.

The generator and bell-operating mechanism are located in the space above the upper door 17. The conductor 5i) leads from the generator to the strip 22 and the conductor 5l leads from the strip 21to the opposite pole of the armature of the generator. Then the coin 49 is inserted in the chute, it falls downwardly and strikes the short end of the lever 4G and the weight of said coin ovcrbalances said lever and the long end of the lever rises until it engages the end 44 of the weighted The telephone-circuit passes from the strip 21 to the strip 22 through the coin 49, thus closing the circuit. lVhen the receiver 15 is again hung upon the hook 1(5,the weight of said receiver overbalances the tension of the springI 24 and the force of the weight 35, and as the outer end of said hook is depressed the weight 35 is elevated,the segmental gear 28 is depressed, and the spur-gear 36 is rotated. The free end of the spring 42 engages the lower end of the weighted lever 45,and as the pinion 36 rotates the weight 45 is carried around and upwardly until it passes over the shaft 37 and then is carried downwardly to its normal po sition by the force of gravity. Thus it will be seen that the weight 45'and the end 44 make complete circles. In passing through the rst quarter of a circle the end 44 passes out of engagement with the long end of the lever 46, thus allowing said lever to swing upwardly to a vertical position and releasing the coin 49 and allowing said coin to run downwardly in the ch nte through the openin g 19, thus breaking the telephone circuit. Thus it will be seen that the telephone-circuit is opened and closed by the coin in the chute and that without the coin the telephone cannot be operated.

1. The combination with a telephone, of a lever pivotally mounted in position to have one of its ends engage under the receiverhook, a second lever pivotally mounted in position to have one of its ends engage the opposite end of the first-mentioned lever from the receiver-hook, a weight attached to said second lever to elevate the receiver-hook, a toothed segment upon the opposite end of the second-mentioned lever from the end which engages the first-mentioned lever, a spur-pinion rotatably mounted in position to be engaged by said toothed segment, a weighted lever mounted upon the spindle carrying said spur-pinion, a frame attached to said spurpinion and carrying a spring, which spring performs the function of a ratchet and engages said weighted lever, a coin-chute, a lever pivotally mounted with one of its ends extending into said coin-chute and the opposite one of its ends in position to be engaged by said weighted lever, said coin-chute being constructed in two parts, said parts being in sulated from each other and used as terminals for the telephone-circuit, the insertion of a coin serving to close the circuit, substantially as specified.

2. In a device of the class described, a telephone-box consisting of the back wall 10, the side walls 11 and 12, the top 13, the bottom 14 and having the receiver-hook 1G pivotally attached to the back wall 10 and extending through the side wall 12, the upper ioor 1T and the lower floor 1S having the opening 1Q, the side wall 11 having the opening 20i1nmediately below the upper floor 17, the U shaped strip of sheet metal 21 connecting the opening20 with the opening 19, the U -shaped strip of sheet metal 22 connecting the upper iioor 17 with the side wall 12 and running parallel with the strip 21, said strips 21 and 22 forming a coin-chute and serving as terminals for the telephone-circuit, substantially as specified.

3. In a device of the class described, the lever 24 pivotally mounted in position to have its end 27 engage under the lever of the receiver-hook, the segmental gear 28 pivotally mounted adjacent to the lever 24, the arm 31 projecting from the segment 28 and engaging the lower end of the lever 24, a weight attached to said arm 31 to overbalance the segment, the spur-gear 36 rotatably mounted in position to be engaged by the teeth of the segment 28, the arm 39 attached to said spurgear, the spring-arm 42 attached to the outer end of the arm 59, theweighted lever 48 pivotally mounted upon the shaft carrying the spur-gear and having its upper end 44 bent forwardly into a horizontal plane, said weighted lever being in position to be engaged by the free end of the spring-arm 42, a coinchute, a lever pivotally mounted with one of its ends projecting into said coin-chute and its opposite end in position to be engaged by the end 44 of the weighted lever, said coinchute being constructed in two parts and serving as terminals for the telephone-circuit and said circuit being closed by the insertion of a coin, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

FREDERICK HOFFMAN. lVitnesses:

BOB MERIWETHER, T. B. KircHnNs.

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